The Korean Journal of Physiology and Pharmacology

  • 제17권3호
  • /
  • Pages.229-235
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  • 2013
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  • 1226-4512(pISSN)
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  • 2093-3827(eISSN)
대한약리학회 (The Korean Society of Pharmacology)
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Electrophysiological and Histologic Evaluation of the Time Course of Retinal Degeneration in the rd10 Mouse Model of Retinitis Pigmentosa

  • Jae, Seol A (Department of Physiology, Chungbuk National University School of Medicine) ;
  • Ahn, Kun No (Department of Physiology, Chungbuk National University School of Medicine) ;
  • Kim, Ji Young (Department of Anatomy, Chungbuk National University School of Medicine) ;
  • Seo, Je Hoon (Department of Anatomy, Chungbuk National University School of Medicine) ;
  • Kim, Hyong Kyu (Department of Microbiology, Chungbuk National University School of Medicine) ;
  • Goo, Yong Sook (Department of Physiology, Chungbuk National University School of Medicine)
  • 투고 : 2012.11.09
  • 심사 : 2013.05.07
  • 발행 : 2013.06.30
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초록

Among several animal models of retinitis pigmentosa (RP), the more recently developed rd10 mouse with later onset and slower rate of retinal degeneration than rd1 mouse is a more suitable model for testing therapeutic modalities. We therefore investigated the time course of retinal degeneration in rd10 mice before adopting this model in our interventional studies. Electroretinogram (ERG) recordings were carried out in postnatal weeks (PW) 3~5 rd10 (n=23) and wild-type (wt) mice (n=26). We compared the amplitude and implicit time of the b-wave of ERG records from wt and rd10 mice. Our results showed that b-wave amplitudes in rd10 mice were significantly lower and the implicit time of b-waves in rd10 mice were also significantly slower than that in wt mice ($20{\sim}160{\mu}V$ vs. $350{\sim}480{\mu}V$; 55~75 ms vs. 100~150 ms: p<0.001) through PW3 to PW5. The most drastic changes in ERG amplitudes and latencies were observed during PW3 to PW4. In multichannel recording of rd10 retina in PW2 to PW4.5, we found no significant difference in mean spike frequency, but the frequency of power spectral peak of local field potential at PW3 and PW3.5 is significantly different among other age groups (p<0.05). Histologic examination of rd10 retinae showed significant decrease in thickness of the outer nuclear layer at PW3. TUNEL positive cells were most frequently observed at PW3. From these data, we confirm that in the rd10 mouse, the most precipitous retinal degeneration occurs between PW3~PW4 and that photoreceptor degeneration is complete by PW5.

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